In Essex the go-to shop for suspension mod's is MCT in Stowemarket
http://www.mctsuspension.co.uk/Home.html
Around the IAM groups this business became known as the guy who fixed the Pan weave . It was recommended to me by several 'progressive', riders and I heard that the IAM chief examiner had his bikes sorted there as well . Like al senior IAM staff at the time, he was ex-Old Bill and continued to ride as if he was still riding a firm's bike . And like all Black Rats his BS meter was extremely sensitive so he wouldn't have it done unless it delivered.
Short -story-made- long there . But we had Darren speak at one of our meetings and I asked him what when wrong and what he did to fix it . He said that in his opinion Honda made the front suspension settings too soft , so that when it came under load, it locked up too frequently leaving the only comnpliant / deformable component as the tyre wall , causing it to deform and then rapidly rebound , setting off the wobble, which kept the suspension under locked and the wobble /weave increasing.
Funnily years earlier I asked an engineer ex-Honda racing around the time the ST1300 was launched in the UK , who had set up as a builder of Lotus 7 and similar race kit cars having come out of Mother Honda the same question. His reply was that:
'The Japanese development riders were too light' .
I didn't understand what he'd meant by that until Darren's talk that night
So what he does is replace the oil and swap out the Honda springs . If necessary he can also modify the internals to either lower the bike or change the flow rates within.
MCT have a great rep generally around the fast bike and race-bike boys in the South East , which you can Google up.
Give MCT a call and have a talk .
I not connected to then in any way